Alert archive / Alabama / Winter Weather Advisories in 2011

Winter Weather Advisory 2, NWS Birmingham, AL

January 25, 20118 counties in Alabama

NWS Birmingham, AL issued this winter weather advisory at Jan 25, 2011, 1:54 PM CST for 8 counties in Alabama. It took effect at Jan 26, 2011, 12:00 AM CST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jan 25, 2011, 1:54 PM CST (19:54 UTC)
In effect from: Jan 26, 2011, 12:00 AM CST
Expired: Jan 26, 2011, 9:00 AM CST
In force: 9 hr
Issued by: NWS Birmingham, AL

Counties Blount County, AL, Cherokee County, AL, Etowah County, AL, Fayette County, AL, Lamar County, AL, Marion County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 94 km from the middle of the area, began a volume at 19:54 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 244 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this winter weather advisory went out at Jan 24, 5:30 PM CST, 20 hours 24 minutes earlier.

Area forecast discussion, Jan 24, 5:30 PM CST, 20 hours 24 minutes before

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Nearby

Winter Weather Advisories in Alabama, 2011 Every winter weather advisory in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.